In my 20s, I worked in IT. Got a new job, oddly the hiring manager wasn't my line manager, and the first day I met line manager she took an instant dislike to me. Possibly as she didn't hire me herself, I don't know. But she was utterly vile.
One of the company perks is that they stocked the staff room fridge with M&S sandwiches, salads and drinks, so everyone got a free lunch. I later learned it just meant that most people worked through their lunch as a result, which is maybe why the company did it? Anyway, come Friday, there'd always be a ton of food going off over the coming weekend that would get binned. So I asked the lady who bought in the food if I could take it all on a Friday to donate to a local homeless charity. To which she happily agreed. No word of a lie, most weeks I filled a bin sack with all the food that was left over.
The first week I did it, I came in Monday and the manager yelled, "Oh, here's Mother Teresa! Off round the streets hanging out with the homeless." I actually just dropped the food off to a volunteer, but wouldn't have been ashamed to go round the streets "hanging out with the homeless". She started making digs at me constantly over anything after that.
One day, I didn't have any work to do, as no IT requests were in my job queue and so asked her for some work. She asked me to start an IT equipment audit, so I went off to look for audit software and she came over and said, "No, you can do it manually!" I had to write down every single mouse, keyboard and monitor in that building.
Anyway, two other things besides her bullying was she took a 10 minute fag break every hour without fail. Which equated to an hour a day, which was almost a day a week.
She also refused to buy licensed software (as IT Manager) and everything was pirated. She also used to buy CDs in Our Price, rip the disc and make copies on work computer, using work blank discs and dish them out to her workmates, before returning the CD for a refund.
The final straw was she was going on holiday and sent an email to a colleague telling her to assign all IT requests to me while she was away, so that when I couldn't cope and failed, she could sack me. The mailbox she sent it to, I also had access to, as the admin lady was only part time and she'd granted me and another desktop support engineer access. So I saw the email before the admin lady deleted it very quickly.
That was it for me, I waited until she went on leave and handed my notice in to my manager's boss (who was hardly ever in that office, which is why she got away with so much). I didn't have the balls to say she was a bully, but I did say that there wasn't enough work for me. I left there and then.
My ex-manager was then interrupted during her holiday to say I'd left. Then when she returned her boss had done some digging about and concluded that there was indeed not enough work to warrant the role that I had left, so he got rid of the role. A colleague I stayed in touch with said my ex-manager was apoplectic with rage about this.
But not as angry as she was when the Federation Against Software theft made an unannounced visit a few weeks later (following my anonymous tip-off) and found all the pirated software in her possession. The company got a big fine and as IT Manager, all the blame fell at her feet.
I don't know what happened after the fine as my ex-colleague who had been keeping me in the loop also left. But it gave me HUGE satisfaction that I got revenge and a better job.